...In November 2014, the then-heads of the Army and Navy wrote a memo titled “Adjusting the Ballistic Missile Defense Strategy,” in which they argued that the “current acquisition-based strategy is unsustainable in the current fiscal environment and favors forward deployment of assets in lieu of deterrence-based options to meet contingency demands.” That same year, the Center for Strategic and Budgetary Assessments noted that “barring technological breakthroughs, the competition in [missile defense and defensive space control] is currently heavily offense-dominant, and thus, ramping up expenditures in a likely futile attempt to actively defend it is a cost-imposing strategy on the United States.”